Make the hull (body) of the ship.Buy wireless radio control kit and connect the batteries and motor with it.Connect the motor to a propeller.Put everything in the ship, the batteries and controllers and check if it floats or not.If it doesn't than try using something more lighter for the hull.And again, questions like these can not be explained in a simple answer, you should try searching for it on the internet like try to google it.
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Far better to Google model ship plans.
Build hull Buy radio control kitInstall. Check ship floats. Result.